<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="https://unpkg.com/vue@next"></script>

    <div id="app">
        <todo-item></todo-item>
    </div>

    <script type="module">
        import A from './compA.js'
        const vueOpt = {
            data(){
                return {

                }
            }
        }

        const app = Vue.createApp(vueOpt);
        app.component('todo-item', {
            data(){
                return {

                }
            },
            components:{
                'component-a': A
            },
            template: `
                <component-a></component-a>
            `
        })

        app.mount('#app');

    </script>
</body>
</html>